diff --git a/src/agents/pi-tools.sandbox-mounted-paths.workspace-only.test.ts b/src/agents/pi-tools.sandbox-mounted-paths.workspace-only.test.ts
new file mode 100644
index 00000000000..df9817fea65
--- /dev/null
+++ b/src/agents/pi-tools.sandbox-mounted-paths.workspace-only.test.ts
@@ -0,0 +1,206 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig } from "../config/config.js";
+import type { SandboxContext } from "./sandbox.js";
+import type { SandboxFsBridge, SandboxFsStat, SandboxResolvedPath } from "./sandbox/fs-bridge.js";
+import { createOpenClawCodingTools } from "./pi-tools.js";
+
+vi.mock("../infra/shell-env.js", async (importOriginal) => {
+  const mod = await importOriginal<typeof import("../infra/shell-env.js")>();
+  return { ...mod, getShellPathFromLoginShell: () => null };
+});
+
+function getTextContent(result?: { content?: Array<{ type: string; text?: string }> }) {
+  const textBlock = result?.content?.find((block) => block.type === "text");
+  return textBlock?.text ?? "";
+}
+
+function createUnsafeMountedBridge(params: {
+  root: string;
+  agentHostRoot: string;
+  workspaceContainerRoot?: string;
+}): SandboxFsBridge {
+  const root = path.resolve(params.root);
+  const agentHostRoot = path.resolve(params.agentHostRoot);
+  const workspaceContainerRoot = params.workspaceContainerRoot ?? "/workspace";
+
+  const resolvePath = (filePath: string, cwd?: string): SandboxResolvedPath => {
+    // Intentionally unsafe: simulate a sandbox FS bridge that maps /agent/* into a host path
+    // outside the workspace root (e.g. an operator-configured bind mount).
+    const hostPath =
+      filePath === "/agent" || filePath === "/agent/" || filePath.startsWith("/agent/")
+        ? path.join(
+            agentHostRoot,
+            filePath === "/agent" || filePath === "/agent/" ? "" : filePath.slice("/agent/".length),
+          )
+        : path.isAbsolute(filePath)
+          ? filePath
+          : path.resolve(cwd ?? root, filePath);
+
+    const relFromRoot = path.relative(root, hostPath);
+    const relativePath =
+      relFromRoot && !relFromRoot.startsWith("..") && !path.isAbsolute(relFromRoot)
+        ? relFromRoot.split(path.sep).filter(Boolean).join(path.posix.sep)
+        : filePath.replace(/\\/g, "/");
+
+    const containerPath = filePath.startsWith("/")
+      ? filePath.replace(/\\/g, "/")
+      : relativePath
+        ? path.posix.join(workspaceContainerRoot, relativePath)
+        : workspaceContainerRoot;
+
+    return { hostPath, relativePath, containerPath };
+  };
+
+  return {
+    resolvePath: ({ filePath, cwd }) => resolvePath(filePath, cwd),
+    readFile: async ({ filePath, cwd }) => {
+      const target = resolvePath(filePath, cwd);
+      return fs.readFile(target.hostPath);
+    },
+    writeFile: async ({ filePath, cwd, data, mkdir = true }) => {
+      const target = resolvePath(filePath, cwd);
+      if (mkdir) {
+        await fs.mkdir(path.dirname(target.hostPath), { recursive: true });
+      }
+      const buffer = Buffer.isBuffer(data) ? data : Buffer.from(data);
+      await fs.writeFile(target.hostPath, buffer);
+    },
+    mkdirp: async ({ filePath, cwd }) => {
+      const target = resolvePath(filePath, cwd);
+      await fs.mkdir(target.hostPath, { recursive: true });
+    },
+    remove: async ({ filePath, cwd, recursive, force }) => {
+      const target = resolvePath(filePath, cwd);
+      await fs.rm(target.hostPath, {
+        recursive: recursive ?? false,
+        force: force ?? false,
+      });
+    },
+    rename: async ({ from, to, cwd }) => {
+      const source = resolvePath(from, cwd);
+      const target = resolvePath(to, cwd);
+      await fs.mkdir(path.dirname(target.hostPath), { recursive: true });
+      await fs.rename(source.hostPath, target.hostPath);
+    },
+    stat: async ({ filePath, cwd }) => {
+      try {
+        const target = resolvePath(filePath, cwd);
+        const stats = await fs.stat(target.hostPath);
+        return {
+          type: stats.isDirectory() ? "directory" : stats.isFile() ? "file" : "other",
+          size: stats.size,
+          mtimeMs: stats.mtimeMs,
+        } satisfies SandboxFsStat;
+      } catch (error) {
+        if ((error as NodeJS.ErrnoException).code === "ENOENT") {
+          return null;
+        }
+        throw error;
+      }
+    },
+  };
+}
+
+function createSandbox(params: {
+  sandboxRoot: string;
+  agentRoot: string;
+  fsBridge: SandboxFsBridge;
+}): SandboxContext {
+  return {
+    enabled: true,
+    sessionKey: "sandbox:test",
+    workspaceDir: params.sandboxRoot,
+    agentWorkspaceDir: params.agentRoot,
+    workspaceAccess: "rw",
+    containerName: "openclaw-sbx-test",
+    containerWorkdir: "/workspace",
+    fsBridge: params.fsBridge,
+    docker: {
+      image: "openclaw-sandbox:bookworm-slim",
+      containerPrefix: "openclaw-sbx-",
+      workdir: "/workspace",
+      readOnlyRoot: true,
+      tmpfs: [],
+      network: "none",
+      user: "1000:1000",
+      capDrop: ["ALL"],
+      env: { LANG: "C.UTF-8" },
+    },
+    tools: { allow: [], deny: [] },
+    browserAllowHostControl: false,
+  };
+}
+
+describe("tools.fs.workspaceOnly", () => {
+  it("defaults to allowing sandbox mounts outside the workspace root", async () => {
+    const stateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-sbx-mounts-"));
+    const sandboxRoot = path.join(stateDir, "sandbox");
+    const agentRoot = path.join(stateDir, "agent");
+    await fs.mkdir(sandboxRoot, { recursive: true });
+    await fs.mkdir(agentRoot, { recursive: true });
+    try {
+      await fs.writeFile(path.join(agentRoot, "secret.txt"), "shh", "utf8");
+
+      const bridge = createUnsafeMountedBridge({ root: sandboxRoot, agentHostRoot: agentRoot });
+      const sandbox = createSandbox({ sandboxRoot, agentRoot, fsBridge: bridge });
+
+      const tools = createOpenClawCodingTools({ sandbox, workspaceDir: sandboxRoot });
+      const readTool = tools.find((tool) => tool.name === "read");
+      const writeTool = tools.find((tool) => tool.name === "write");
+      expect(readTool).toBeDefined();
+      expect(writeTool).toBeDefined();
+
+      const readResult = await readTool?.execute("t1", { path: "/agent/secret.txt" });
+      expect(getTextContent(readResult)).toContain("shh");
+
+      await writeTool?.execute("t2", { path: "/agent/owned.txt", content: "x" });
+      expect(await fs.readFile(path.join(agentRoot, "owned.txt"), "utf8")).toBe("x");
+    } finally {
+      await fs.rm(stateDir, { recursive: true, force: true });
+    }
+  });
+
+  it("rejects sandbox mounts outside the workspace root when enabled", async () => {
+    const stateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-sbx-mounts-"));
+    const sandboxRoot = path.join(stateDir, "sandbox");
+    const agentRoot = path.join(stateDir, "agent");
+    await fs.mkdir(sandboxRoot, { recursive: true });
+    await fs.mkdir(agentRoot, { recursive: true });
+    try {
+      await fs.writeFile(path.join(agentRoot, "secret.txt"), "shh", "utf8");
+
+      const bridge = createUnsafeMountedBridge({ root: sandboxRoot, agentHostRoot: agentRoot });
+      const sandbox = createSandbox({ sandboxRoot, agentRoot, fsBridge: bridge });
+
+      const cfg = { tools: { fs: { workspaceOnly: true } } } as unknown as OpenClawConfig;
+      const tools = createOpenClawCodingTools({ sandbox, workspaceDir: sandboxRoot, config: cfg });
+      const readTool = tools.find((tool) => tool.name === "read");
+      const writeTool = tools.find((tool) => tool.name === "write");
+      const editTool = tools.find((tool) => tool.name === "edit");
+      expect(readTool).toBeDefined();
+      expect(writeTool).toBeDefined();
+      expect(editTool).toBeDefined();
+
+      await expect(readTool?.execute("t1", { path: "/agent/secret.txt" })).rejects.toThrow(
+        /Path escapes sandbox root/i,
+      );
+
+      await expect(
+        writeTool?.execute("t2", { path: "/agent/owned.txt", content: "x" }),
+      ).rejects.toThrow(/Path escapes sandbox root/i);
+      await expect(fs.stat(path.join(agentRoot, "owned.txt"))).rejects.toMatchObject({
+        code: "ENOENT",
+      });
+
+      await expect(
+        editTool?.execute("t3", { path: "/agent/secret.txt", oldText: "shh", newText: "nope" }),
+      ).rejects.toThrow(/Path escapes sandbox root/i);
+      expect(await fs.readFile(path.join(agentRoot, "secret.txt"), "utf8")).toBe("shh");
+    } finally {
+      await fs.rm(stateDir, { recursive: true, force: true });
+    }
+  });
+});
diff --git a/src/agents/pi-tools.ts b/src/agents/pi-tools.ts
index 413deb32ea3..cdc7a1fdba4 100644
--- a/src/agents/pi-tools.ts
+++ b/src/agents/pi-tools.ts
@@ -276,12 +276,11 @@ export function createOpenClawCodingTools(options?: {
   const base = (codingTools as unknown as AnyAgentTool[]).flatMap((tool) => {
     if (tool.name === readTool.name) {
       if (sandboxRoot) {
-        return [
-          createSandboxedReadTool({
-            root: sandboxRoot,
-            bridge: sandboxFsBridge!,
-          }),
-        ];
+        const sandboxed = createSandboxedReadTool({
+          root: sandboxRoot,
+          bridge: sandboxFsBridge!,
+        });
+        return [workspaceOnly ? wrapToolWorkspaceRootGuard(sandboxed, sandboxRoot) : sandboxed];
       }
       const freshReadTool = createReadTool(workspaceRoot);
       const wrapped = createOpenClawReadTool(freshReadTool);
@@ -365,8 +364,18 @@ export function createOpenClawCodingTools(options?: {
     ...(sandboxRoot
       ? allowWorkspaceWrites
         ? [
-            createSandboxedEditTool({ root: sandboxRoot, bridge: sandboxFsBridge! }),
-            createSandboxedWriteTool({ root: sandboxRoot, bridge: sandboxFsBridge! }),
+            workspaceOnly
+              ? wrapToolWorkspaceRootGuard(
+                  createSandboxedEditTool({ root: sandboxRoot, bridge: sandboxFsBridge! }),
+                  sandboxRoot,
+                )
+              : createSandboxedEditTool({ root: sandboxRoot, bridge: sandboxFsBridge! }),
+            workspaceOnly
+              ? wrapToolWorkspaceRootGuard(
+                  createSandboxedWriteTool({ root: sandboxRoot, bridge: sandboxFsBridge! }),
+                  sandboxRoot,
+                )
+              : createSandboxedWriteTool({ root: sandboxRoot, bridge: sandboxFsBridge! }),
           ]
         : []
       : []),